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Thin and tough

Focal understands that it's not easy to get bass into every vehicle. They built the IBus 20 powered subwoofer to address this issue, so folks with bass-deficient systems in space-challenged vehicles could add some low-end punch. At just under 3" tall, this sub can fit under or behind many seats in the spaces usually reserved for stale bits of food. Focal built its chassis out of rigid aluminum, so it'll take a beating while it provides an incredibly stable home for the 8" sub.

This enclosure clocks in at less than 3 inches thick

Big bass in a tight space

You'll finally hear bass lines and percussion in your music, as the IBus 20's 8" sub combines with a built-in 75-watt RMS amplifier to deliver some impressive bass. This sub comes with line-level inputs that'll connect to an aftermarket stereo, along with inputs that accept the speaker-level signal from a factory radio.

You can use the low-pass crossover to get your bass to mesh with the rest of your system, while the phase switch ensures that this sub is working together with the bass from your full-range speakers. Focal includes a wired remote control so you can adjust the bass with a flick of your wrist.

Who needs a powered subwoofer?

To produce bass, you need a sub, an enclosure, and an amplifier, and it can be little tricky to match them all up. A powered sub eliminates all the hassle, as the manufacturer designs the enclosure to house the sub and amp together. This all-in-one solution is especially useful in smaller vehicles, where there's no room to mount a separate amp, or in any vehicle where you need every bit of cargo space. Powered subs range from small, flat boxes that fit under your seat to larger boxes that go in your trunk.

Product Research

Features

Overview: The IBUS 20 amplified subwoofer features a 75-watt
RMS (150-watts max) amp and an 8" sub housed in a compact aluminum enclosure,
designed to fit in tight spaces.

Wired Remote Control: The wired remote control puts control
of your subwoofer output within easy reach. The remote can be mounted using the
included self-tapping screw. The dimensions are:

Width: 1-3/16"

Height: 1"

Depth: 1-3/4" (2-3/8"
including the knob)

Mounting: The subwoofer, under 3" tall, can be mounted
flat under a seat in the passenger compartment of many vehicles.

Subsonic Filter: Frequencies that cannot be reproduced by the
subwoofer do not become sound, but unnecessary oscillations causing distortion;
these frequencies also waste amplifier power and can damage speakers. The subsonic
filter removes inaudible frequencies to improve the performance of the speakers
by eliminating this harmful distortion. The subsonic filter's crossover point is
variable from 20 to 50 Hz.

Controls

Gain: rotary dial to set the amplifier gain control; 200mV
to 5 volts

Subsonic Filter: rotary dial to control the high pass crossover
frequency; 20 to 50 Hz

Connections

Power: set screw terminals for power, ground, and remote
turn-on; each accepts up to 8-gauge wire

Line Input: stereo RCA inputs

Speaker Input: Molex plug for use with the included wiring
harness

Remote Bass: RJ-25 jack for use with the included wired
remote

Fuses: two 15-amp ATO fuses installed in the chassis

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Coming-around

Written By jimmy t, Texas on Saturday, February 28, 2015

I put this sub in a F150 crew cab and was not impressed when I first had it. It's powered by my factory deck so I wasn't expecting too much, but I was expecting more than I received. About 1-month ago I was carrying two, 1-gallon jugs of water in the back of the cab and spilled one of the jugs on the rubber floor mats I have protecting the carpet; the sub was on the mats so I was quick to get the water before it got to the sub. I cleaned the water and decided to put the sub under the rubber mats, since doing this the bass coming from the unit is noticeably improved, in-line with what I was expecting when I first chose it. I guess it was just a matter of too much space for a small unit.

Focal Sub

Took some time to run power wires into cab and tap into back speakers.Factory F-150 with Focals in doors and new Sub is now ROCKIN'!! not too much bass, just enough to fill in the bottom end This will NOT rattle windows

Great Add-On

For the size, this unit has great sound and is very well constructed. I added this to my 2014 Subaru XV Crosstrek and it nicely filled in the missing bottom end. If you're looking for something with good sound and not just bass to overwhelm your music, this is a great choice.

Perfect Upgrade

I originally purchased the Sound Ordnance underseat subwoofer but after 2 failing I upgraded to this. This was a huge upgrade, much better build quality and sound. It is slightly larger so may have some issues fitting it under all seats. I have a 2009 GMC Sierra Hybrid and it fit under the front driver seat just fine. Perfectly rounded out the lows and sounds much better than a stock bose system if you have one of those. Keep in mind this is a European product so the harness will most likely not be plug and play to an American vehicle. You will have some rewiring to do if you want to use the high level inputs. Preamp out would be no different

iBus 20

Nice, compact unit. Does what I expected: filled out the bottom end of the spectrum. No breaking windows or setting off car alarms as I drive by. Nice solid bass for the money and the size. Replaced Harman Kardon powered sub (2 - 6x9) in BMW E46 Coupe. Pretty easy install.

WOW!

I guess you can call me a Focal freak! I bought this sub because it was small enough to fit under the seat of my single cab 2001 Ford Lightning, this sub is well made sounds great, thats something you can count on from Focal speakers I have them in all 3 of my vehicles

Pros:SIZE, SOUND, AND THE CONSTRUCTION OF IT ALL METAL CASING REALLY PRETTY TOO!

Good Little Sub

I picked this up to add some bottom end to my 2014 Forester. This sub/map fills the bill nicely. It first almost perfectly under the front driver seat, sounds good and gets plenty loud enough for my purposes. This will not win any SPL contests but does provide solid bass and seems like a well built device.

Garbage

Let me start by saying my 2012 Corolla has Focal p165v30 component speakers in the front and Focal 690 CA1 SG coaxial speakers in the back powered by a Alpine MRX-V70 5 channel amp, and a factory Pioneer navigation head unit. So I am a die hard Focal supporter and truly believe they make incredible products. However this unit is junk, I had my entire system installed by a local shop, who's owner has been awarded #20 installer in the entire USA three year in a row. He told me to stay clear but I really wanted this unit due to its size. I was able to bolt it directly to my cars rear seat and it took up virtually no space. However it produced very little bass even when turned all the way up. This sub was barley able to shake the seat it was bolted too. Then after a short two weeks it blew a voice coil, I was devastated and shocked because its a Focal and at this price. The owner at the audio shop ordered me a replacement and even put it in for free. Three short weeks later that one blew the circuit board. Finally I had it taken out and was livid to say the least. The shop owner suggested that I buy the JL CP108LG-W3v3 and bolt it in the same location and since I already had a 5 channel amp wiring was a breeze. Man am I happy I took his advice now this is a sub. It shakes my car like nothing I ever seen before. A complete night and day experience. All I can say is Focal should be ashamed of themselves for ever putting this on the market. STAY FAR AWAY !!

Pros:None

Cons:It does not produce much bass at all even in a small sedan.
It breaks esaily.

Great for a boat

I wanted a subwoofer to put in the cabin of my boat. I did not want to cut holes or see the subwoofer when I was finished. An integrated subwoofer seemed to be the best option and the Focal looked like a quality product. The Focal is well made with a heavy aluminum case. I installed the subwoofer in a locker that also holds an air conditioner. This means that there is a large vent in the locker that will allow the sound to escape. It took a little while with the adjustments as there was some boominess at certain frequencies. I'm pretty sure the boominess was due to the install location rather than the subwoofer itself. The system sounds great without a big speaker grill located in the cabin. I recommend the Focal IBus 20 if you need more bass but don't want a big box or speaker grill. The Focal is not water resistant, so make sure it is installed inside your boat.

Doesn't fit Honda FIT

Written By nestaselect, ATL on Monday, February 11, 2013

I can't speak to the sound quality. The build seems VERY solid. I couldn't use it because I needed something to add Low-End to my Honda FIT without taking up valuable cargo space. Unfortunately, the only place that this will fit is in the rear cargo area..That doesn't work for me.

great little sub

I have a Toyota Tacoma extended cab truck and I wanted a SUB but not the usual set up of a big enclosure taking up space. I research and I came upon the iBUS 20 by Focal and I glad I did. This little sub packs a punch literally. There is also a bass knob control which you can fine tune to your liking. I have it a little over 2 months and just turn the gain up and its sounds amazing. If you are looking for something to rock the neighborhood, look else where but seriously, this compact sub will make your sounds fuller, your bass bumps, and make your drive enjoyable.

Pros:Space saver, Great sound. No complaints

Cons:You may need to get an amp wiring kit. The plug and play harness cables included (ISO cables) does not work for my vehicle. I think they are for europeans cars.